CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net loss	$ (162,602)us-gaap_NetIncomeLoss	$ (274,158)us-gaap_NetIncomeLoss	$ (220,872)us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Net unrealized gains (reclassification adjustment) on marketable securities		(20)	20
Cumulative translation adjustment	214	(40)
Defined benefit pension obligation	(2,864)	(1,495)
Other comprehensive income (loss)	(2,650)	(1,555)	20
Comprehensive loss	$ (165,252)us-gaap_ComprehensiveIncomeNetOfTax	$ (275,713)us-gaap_ComprehensiveIncomeNetOfTax	$ (220,852)us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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